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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: Giải các phương trình sau: a)x(x-1)(x+1)(x+2)=24 b)$x^{4}$ +$2x^{3}$- $2x^{2}$ +2x-3=0 c)$x^{3}$ -$6x^{2}$ +12x+19=0 d)$x^{3}$ +$5x^{2}$ -4x-20=0 e)$x^{4}$ -$5x^{3}$-$12x^{2}$ -5x+1=0 { "@context": "https://schema.org", "@type": "QAPage", ...

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